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Estimating forest species abundance through linear unmixing of CHRIS/PROBA imagery / S. Stagakis in ISPRS Journal of photogrammetry and remote sensing, vol 119 (September 2016)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 119 (September 2016) . - pp 79 - 89 Titre : Estimating forest species abundance through linear unmixing of CHRIS/PROBA imagery Type de document : Article/Communication Auteurs : S. Stagakis, Auteur ; Theofilos Vanikiotis, Auteur ; Olga Sykioti, Auteur Année de publication : 2016 Article en page(s) : pp 79 - 89 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] analyse des mélanges spectraux [Termes descripteurs IGN] carte de la végétation [Termes descripteurs IGN] classification bayesienne [Termes descripteurs IGN] effet d'ombre [Termes descripteurs IGN] espèce végétale [Termes descripteurs IGN] Fagus sylvatica [Termes descripteurs IGN] Grèce [Termes descripteurs IGN] image hyperspectrale [Termes descripteurs IGN] image Landsat-8 [Termes descripteurs IGN] image PROBA-CHRIS [Termes descripteurs IGN] orthoimage [Termes descripteurs IGN] parc naturel national [Termes descripteurs IGN] partition d'image [Termes descripteurs IGN] Pinus nigra [Termes descripteurs IGN] richesse floristique [Vedettes matières IGN] Inventaire forestier Résumé : (Auteur) The advancing technology of hyperspectral remote sensing offers the opportunity of accurate land cover characterization of complex natural environments. In this study, a linear spectral unmixing algorithm that incorporates a novel hierarchical Bayesian approach (BI-ICE) was applied on two spatially and temporally adjacent CHRIS/PROBA images over a forest in North Pindos National Park (Epirus, Greece). The scope is to investigate the potential of this algorithm to discriminate two different forest species (i.e. beech – Fagus sylvatica, pine – Pinus nigra) and produce accurate species-specific abundance maps. The unmixing results were evaluated in uniformly distributed plots across the test site using measured fractions of each species derived by very high resolution aerial orthophotos. Landsat-8 images were also used to produce a conventional discrete-type classification map of the test site. This map was used to define the exact borders of the test site and compare the thematic information of the two mapping approaches (discrete vs abundance mapping). The required ground truth information, regarding training and validation of the applied mapping methodologies, was collected during a field campaign across the study site. Abundance estimates reached very good overall accuracy (R2 = 0.98, RMSE = 0.06). The most significant source of error in our results was due to the shadowing effects that were very intense in some areas of the test site due to the low solar elevation during CHRIS acquisitions. It is also demonstrated that the two mapping approaches are in accordance across pure and dense forest areas, but the conventional classification map fails to describe the natural spatial gradients of each species and the actual species mixture across the test site. Overall, the BI-ICE algorithm presented increased potential to unmix challenging objects with high spectral similarity, such as different vegetation species, under real and not optimum acquisition conditions. Its full potential remains to be investigated in further and more complex study sites in view of the upcoming satellite hyperspectral missions. Numéro de notice : A2016-778 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1016/j.isprsjprs.2016.05.013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82473 [article]

Tracking seasonal changes of leaf and canopy light use efficiency in a Phlomis fruticosa Mediterranean ecosystem using field measurements and multi-angular satellite hyperspectral imagery / S. Stagakis in ISPRS Journal of photogrammetry and remote sensing, vol 97 (November 2014)

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 97 (November 2014) . - pp 138 – 151 Titre : Tracking seasonal changes of leaf and canopy light use efficiency in a Phlomis fruticosa Mediterranean ecosystem using field measurements and multi-angular satellite hyperspectral imagery Type de document : Article/Communication Auteurs : S. Stagakis, Auteur ; Nikos Markos, Auteur ; Olga Sykioti, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 138 – 151 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes descripteurs IGN] climat méditerranéen [Termes descripteurs IGN] flore locale [Termes descripteurs IGN] Grèce [Termes descripteurs IGN] image hyperspectrale [Termes descripteurs IGN] image multiangulaire [Termes descripteurs IGN] image PROBA-CHRIS Résumé : (Auteur) Numerous normalized difference spectral indices (NDSIs) derived from leaf measurements and CHRIS/PROBA hyperspectral and multi-angular satellite images were examined for their capacity to track seasonal variations of leaf (εleaf) and canopy (εcan) light use efficiency of a Mediterranean phryganic ecosystem. A series of seasonal field ecophysiological measurements, i.e. leaf area index (LAI), leaf photosynthesis and leaf reflectance, were conducted on the Phlomis fruticosa shrubs at the days of CHRIS acquisitions over the study site. Leaf scale analysis confirmed background theory on the relationship of the photochemical reflectance index (PRI) with εleaf and provided a detailed view of the wavelengths that can be used in PRI formulation for the specific species. In canopy scale analysis, PRI and some alternative formulations of this index based on CHRIS bands, presented the most significant relationships with εcan, indicating that this index preserves its efficiency in satellite observations for the specific ecosystem. Additionally, spectral indices related to chlorophyll and water content were found to present good relationships with εcan. Taking into account the functional relationship between εcan and chlorophyll content, a combination of the xanthophyll de-epoxidation band (531 nm) with 701 nm CHRIS band in a NDSI is suggested as an alternative to the original PRI formulation that could improve seasonal εcan estimations. The satellite observation geometry effects on the determination of εcan were not very intense for the studied ecosystem. However, the most effective viewing direction was proved to be the backward scattering, while zenith observations were the least efficient for the specific ecosystem, most probably due to increased background effects. Even though the sensitivity of the original PRI formulation to εcan was reduced in forward scattering viewing directions, when 531 nm xanthophyll de-epoxidation band was replaced with higher wavelength bands (540–550 nm), a strong PRI–εcan relationship reappeared. These findings indicate possible shift of xanthophyll de-epoxidation signal according to viewing direction. Numéro de notice : A2014-528 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74141 [article]

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Méthodes d'évaluation d'un modèle numérique de terrain issu de SPOT pour l'analyse géomorphologique / Olga Sykioti (1990)

Public Titre : Méthodes d'évaluation d'un modèle numérique de terrain issu de SPOT pour l'analyse géomorphologique Type de document : Mémoire Auteurs : Olga Sykioti, Auteur Editeur : Toulouse : Groupement pour le Développement de la Télédétection Aérospatiale GDTA Année de publication : 1990 Importance : 100 p. Format : 21 x 30 cm Note générale : Mémoire de DESS télédétection Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes descripteurs IGN] Aix-en-Provence [Termes descripteurs IGN] analyse texturale [Termes descripteurs IGN] extraction automatique [Termes descripteurs IGN] géomorphologie locale [Termes descripteurs IGN] image SPOT [Termes descripteurs IGN] modèle numérique de terrain [Termes descripteurs IGN] reconnaissance de formes [Termes descripteurs IGN] réseau hydrographique Index. décimale : CETEL Mémoires pour le CETEL ou le DESS ou mastère Télédétection Numéro de notice : 60115 Thématique : IMAGERIE Nature : Mémoire CETEL - DESS Télédétection Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=52524

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